Two substances that are useful for dissolving blood clots are

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Urokinase and streptokinase are both enzymes that are used to dissolve blood clots. Urokinase is naturally found in the human body and activates plasmin, an enzyme that breaks down blood clots. Streptokinase is derived from streptococcus bacteria and also activates plasmin. Both of these substances are used clinically in cases of thrombosis or embolism. Thrombus and embolus (A) are not substances but rather medical terms describing blood clot formations. Factor IV and Factor XII (C) are clotting factors involved in the coagulation cascade, not substances used to dissolve clots. Calcium ions and prothrombin activator (D) are both involved in the process of blood clotting, not in dissolving clots.

Two Substances That Are Useful for Dissolving Blood Clots Are